Pick out the wrong statement ?
Pick out the wrong statement?
Pick out the wrong statement?
Pick out the wrong statement?
Pick out the correct statement?
Pick out the wrong statement ?
Pick out the wrong statement?
Pick out the correct statement?
Pick out the wrong statement ?
There is no correspondence between stoichiometric and the rate equation in case of a/an __________ reaction?
Specific rate constant for a second order reaction__________?
A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is__________?
Velocity of a reaction depends upon the__________?
From among the following, choose one which is not an exothermic process ?
A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be __________?
The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is__________?
Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH → C2H4 + H2O 2C2H5OH → C2H5 – O – C2H5 + H2O The percent conversion of ethanol in the reactor is__________?
‘If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process’. The diffusivity under this condition is called ‘Knudsen diffusivity’, which is affected by the__________?
In a semi-batch reactor __________?
A catalyst loses its activity due to__________?
Transition state theory relates the above quantities as__________?
The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is__________?
Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?
The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is__________?
For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cp n, then what is the value of ‘n’ for this chemical reaction ?
The rate constant of a chemical reaction decreases by decreasing the__________?
If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________?
In an exothermic chemical reaction, the reactants compared to the products have__________?
BET apparatus__________?
The half life period of a first order reaction is given by (where, K = rate constant) ?
The reason why a catalyst increases the rate of reaction is that, it__________?
A catalyst__________?
The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?
Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?
In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the__________?
For a heterogeneous catalytic reaction__________?
For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is__________?
A photochemical reaction is __________?
For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor?
Sometimes, batch process is preferred over continuous process, when the product__________?
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?
A batch reactor is__________?
Radioactive decay follows __________ order kinetics?
The single parameter model proposed for describing non-ideal flow is the __________ model?
Photochemical reaction rate does not depend significantly on temperature, because__________?
A batch reactor is suitable for__________?
A backmix reactor__________?
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption?
In the reversible reaction of the type, A + B ⇌ AB, in general__________?
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg mole?

Pick out the wrong statement?

A. Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value &
chemical agents, is maximum at a temperature of about 45°C
B. Most of the enzyme catalysed reactions involve at least two substrates
C. Enzymes help in increasing the activation energy of the reaction
D. Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the
thermodynamic properties of substrates & products

Correct Answer: Enzymes help in increasing the activation energy of the reaction ✔

Last Updated: March 07, 2019